60 ILCS 1/150-25
The board of managers shall, in the resolution authorizing the bonds, provide for the collection of a direct annual tax sufficient to pay the interest and principal of the bonds as each falls due. A certified copy of the resolution authorizing the bonds and levying the tax shall be filed in the office of the county clerk of the county in which the township is located. The county clerk shall extend annually against the property in the township a tax sufficient to raise in each year the amount provided in the resolution for the payment of principal and interest in that year. In any event and despite any error or insufficiency of amount that may occur in the resolution, the county clerk shall extend annually against the property in the township a tax sufficient to pay the interest on the bonds in each year and to discharge the principal of the bonds within the period for which the bonds have been issued.
60 ILCS 1/150-25